Disk defrag shadow active?

Hey guys,.

While browsing a few docs, I read this - "never do a defrag disk in a virtual machine that has snapshots active" - now why is - this - because it will defragment the disk but just write that data in the snapshot of the file rather than to actually do it to block on the vmdk file level?

Please comment

R

Essentially, the concern is that the snapshot files can inflate very quickly and consume a lot of space.  If the partition is significantly fragmented, all these changes are written the snapshot file.  For example, you could end up with files of great snapshots as a period of heavy IO.  You will also have an I/O impact when you consolidate changes in the snapshot to the primary virtual disk file.

Tags: VMware

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